I just finished rebuilding my calipers, a first-time project, and here are some observations that may be helpful:
This project is made possible by the handy rebuild kit MaxBMW sells (p/n 34 11 2 310 493) -- buy one for each caliper. Also buy the set of three pins and a spring that hold your pads in place for each caliper (34 11 1 454 005), and shiny new mounting screws (07 11 9 901 049) and washers (07 11 9 904 198) for when you put your calipers back on your bike. All of these items are the same for front and rear calipers.
I also sprung for a new fluid reservoir for my back brake -- p/n 34 31 1 451 863, tho I bought the hose and clamps from Bevel Heaven.
Bevel Heaven
https://store.bevelheaven.com/Brake-Related-Parts/ sells all kinds of Brembo bits, and there are things you can find there for cheaper than Max, like vent screws and dust caps. Be aware that Ducati used several different Brembo models, so you have to know what you're ordering. The proprietor, Steve, will answer emails and help you out. Good guy.
As for the how-to. Clymer has its usual hyper-detailed steps for disassembly and reassembly, and I also found this piece on the Motorcycle Classics website:
https://www.motorcycleclassics.com/classic-motorcycle-repair/brake-caliper-rebuild-zmmz11sozrawBut hands down the best guidance I found was two pages of instructions you can download from Bevel Heaven for $10. Want to know how to get your pistons out without compressed air or a huge vise? This is where.
It's not a difficult project but does require a clean space to work, a place where you can manage the brake fluid that inevitably spills when you split the calipers, and a place where it's OK to spray the noxious brake cleaner fluid (I had a couple of warmish days so I could do that outside). The fluid behind the pistons in my front calipers was semi-congealed, which was alarming and also made me glad I've done the full rebuild, because flushing/bleeding the brakes many times did not get that gunk out.
Now for spring to come!
ETA: The bolts that attach the rear caliper to the bike are *supposed* to be about 2 turns shorter than the front ones. Use an extra washer to prevent the tip of the bolts from binding the rotor.
